212202121102021 has 4 divisors (see below), whose sum is σ = 213873003945472. Its totient is φ = 210531238258572.

The previous prime is 212202121101833. The next prime is 212202121102033. The reversal of 212202121102021 is 120201121202212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212202121102021 - 2²⁵ = 212202087547589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212202121102021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212202121102061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835441421535 + ... + 835441421788.

It is an arithmetic number, because the mean of its divisors is an integer number (53468250986368).

Almost surely, 2^{212202121102021} is an apocalyptic number.

It is an amenable number.

212202121102021 is a deficient number, since it is larger than the sum of its proper divisors (1670882843451).

212202121102021 is a wasteful number, since it uses less digits than its factorization.

212202121102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670882843450.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212202121102021 its reverse (120201121202212), we get a palindrome (332403242304233).

The spelling of 212202121102021 in words is "two hundred twelve trillion, two hundred two billion, one hundred twenty-one million, one hundred two thousand, twenty-one".